Slab ceiling construction



Dec. 17, 1929.

H. E. MARKS SLAB CEILING CONSTRUCTION Filed May 14, 19528 2 Sheets-Shet' l #ILA Dec. 17, 1929.

wnNsssEs H. E. MARKS SLAB CEILING CONSTRUCTION Filed May 14. 1928 2 Sheets-Sheet 2 INVENToR Patented Dec. 17, 1929 UNITED v STATES HERBERT E. MARKS, OF SEWICKLEY, PENNSYLVANIA SLAB CEILING CONSTRUCTION Application led May 14, 1928. Serial No. 277,426.

The invention relates to slabceilings ofy plan view of a portion of a slab ceiling, the

plane of View being indicated by the line -L Fig. 2; Fig. 2 ayertical sectional view taken on the line II-II, Fig. 1; Fig. 3 a vertical sectional view taken on theline III-IIL Fig.` 1; Fig. 4l a top plan and Fig. 5 an end elevation, respectively, of a modied form of vceiling slab; and Figs. 6 and 7 perspective views of formsvof clips for attaching ceiling slabs to floor beams.

In the practice of this invention there are provided pre-formed ceiling slabs of cementitious material, such as gypsum, concrete, and the like, having molded in them longitudinally extending bars which project i above the tops of theslabs and which are preferably provided atY their upper edges with horizontally disposed flanges. The slabs are arranged beneath floor beams with the upper edges or flanges of the barsy bearing against the lower flanges of the beams to properly and uniformly space the slabs from the beams. Clips are provided for engaging the upwardly. projecting portions of the slab bars and the lower flanges of the beams for attaching `the slabs to the beams, .the clips preferably being in the form of -bent plates having vertical legs provided with' slots for telescopicallyv engaging flanges of theslab bars, and having horizontal legsv extending over the tops of the lower flanges of the beams. Preferably, the slab bars are molded in the slabs at their sides, and the lower portions of the slabs below the bars preferably project outwardly to form a trough between the sides of adjacent slabs. When clips of the form just explained are used, their verticallegs extend downwardly into these troughs,'and a fill of cementitious material placed in the troughs anchors the clips in their slab-attaching positions.v To firmly hold the barsl in the slabs, anchoring members engage the'bars within and extend transversely of each slab.

Referring Inow to the embodiment of the invention illustrated particularly in Figs. 1, 2 and 3, apair of floor beams l are shown in the spaced relationship in which they normally exist infloors. Beneath the beams there are pre-formed slabs 2, each having a channel 3 molded-in it at each side extend- 65 ing the full length of the slab.. The upper 'portions of the channels project above the upper faces of the slabs, and thechannels are preferably arranged with their flanges extending voutwardly from the sides of the slabs. As shown particularly in Fig. '3, the lower portion of'each side of each slab below channel 3 projects upwardly beyond the tops of the slabs to form troughs between the adjacent sides of the slabs, which troughs are filled with a body of cementitious material for a purpose presently to be explained.

lThe slab-supporting'bars are preferably anchored in the slabs by members extending transversely of the slabs. For this purpose, in the form of slab shown in Figs. 1, 2 and 3, metal strips 4 are welded or otherwise attached to channels 3, the strips having their ends-bent upwardly adjacent to the webs-of 85V the channels to make such connections. If desired, wire fabric or other reinforcing material 5 maybe incorporated inthe slabs, and when this is done the reinforcingmaterial may conveniently be supported by strips l during the moldingl of the slabs.

The preferred form of clips for attaching the ceiling slabs to the ,beams isas shown in Fig. 6, a bent. plate 6, having a vertical leg provided with a slot 7 shaped toreceive 95 the upper outstanding flange and the upper portion of the web of a channel. 3, and having a horizontal leg adapted to rest upon the upper face of the bottom flange of a beam 1. In attaching a ceiling slab 2 to beams 1 100 by means of clips 6, a clip is telescopically received by the upper portion of each end of each channel 3, the slab is then positioned below the lower flanges of adjacent beams with the upper flanges of bars or channels 3 adjacent to the lower faces of the beams, and clips 6 are then moved towards the beams into binding engagement with the bottom flanges of the beams. After the slabs have been thus erected and attached, fills 8 of cementitious materialare placed in the troughs formed between the sides of adjacent slabs, the fills being of such depth as to encase the lower portions of the vertical flanges of the clips 6 so that when the fills set the clips become firmly locked in their slab-attaching positions.

In Figs. 4 and 5 there is illustrated a modified form of slab 2a, in which the slab-supporting bars are formed of Ts 9 having their webs molded inthe slab 'and their heads or flanges projecting above its upper surfaces. To anchor the Ts in the slab, their webs are preferably provided with a series of perforations which receive rods 10 extending transversely of and molded in the slab. In Fig. 7 there fis shown a form of clip for attaching slabs of the formshown in Figs. 4 vand 5 to beams 1. The clip comprises a bent'plate 11 having a vertical leg provided with a T- shaped slot 12 adapted to receive the upwardly projecting portions of Ts 9. If desired, the metal stamped from clip 11 to form sloty 12 may be bent upwardly to form a horizontally disposed tongue 13 which may be welded or otherwise secured to the top of a T to hold the clip in its slab-attaching position.

According to the provisions of the patent statutes, I have explained the principle and mode of operation of my invention, and have described what I now consider to be its best embodiments. However, I desire to have it understood that, within the scope of the apl pended claims, the invention may be practiced otherwise than 'as specificallyillustrated and described. j

I'claim as my invention :V y

1. A slab ceiling comprising a plurality of spaced beams, slabs of cementitious material extending between said beams below their lower flanges and having longitudinally extending bars molded in them and projecting vabove their upper faces, and clips engaging the upwardly projecting portions of said bars and the bottom flanges Aof said beams for attaching the slabs tothe beams.

2. A slab ceiling comprising a plurality of spaced beams, slabs of cementitious material extending between said beams below their lower flanges and having molded in them longitudinally extending bars provided above the tops of lthe slabs with horizontally disposed flanges, and clips engaging the bottom flanges of said beams and the flanges of said bars for attaching the slabs to the beams.

3. A slab ceiling comprising a plurality of spaced beams, slabs of cementitious material extending between said beams below their lower flanges and having molded in them longitudinally extending bars provided above the tops of the slabs with horizontally disposed flanges, and clips provided with slots telescopically engaging the flanges of said barsl and having horizontal legs engaging the upper faces of th'edw'er flanges of the beams for attaching the slabs to the beams.

Ll. A slab ceiling comprising a pluralityL of spaced beams, 'slabs of cementitious ma-l terial extending between said beams below their lower flanges and having molded in them longitudinally extending bars provided above the tops of the` 'slabs with horizontally disposed flanges, the upwardly projecting` port-ions of said bars spacing the slabs from the lower flanges of the beams, andclips engaging the bottom lflanges of said beams and provided withl slots telescopically engaging the flanges of 'said bars for attaching-the slabs to the beams.

5. A slab ceiling comp-rising a plurality of spaced beams, slabs of cementitious mate.-

-rial extending between, said beams vbelow their lower flanges and having bars molded in them at their sides, said bars projecting upwardly above the upper faces lof lthe slabs and having horizontally disposed `flanges at their upper edges and clips engaging the flanges of said bars and the lower flanges of said beams for attaching the slabs .to .the beams. j

6. A slab ceiling comprising apluralityof spaced beams, slabs `of cemetitious vmaterial extending between said beams below their lower flanges and 'having bars molded Vin them at their sides, said bars projecting'upwardly above the upperfaces of theslabs and having horizontally disposed flanges ,at their upper edges, the lower portions of the sides of the slabs projecting outwardly beyond their tops to form troughs between the sides of adjacent slabs, clips engaging .the flanges of said bars and the lower. flanges'of said beams for attaching the vslabs to the beams, and fills .of cementitious material'in said troughs engaging said clips and .anchoring them in their slab-attaching positions.

7. A slab ceiling comprising a. plurality 'of spaced beams, slabs of cementitious material extending between said beams below their lower Vflanges and having bars -molded .in them at their sides, said bars projecting up'- wardly above `the upper faces ofthe slabs andthe lower portions of the sides yof vthe slabs below the bars projecting outwardly to form troughs vbetween the sides of adjacent slabs, clips engaging said bars and the lowr flanges of said beamsfor attaching the slabs tothe beams,jand fills of cementitious mai terial in said troughs engaging said yclips `ngo iso

and anchoring them in theirslab-attaching positions.

8.' A slab ceiling comprising a plurality of spaced beams, slabs of cemetitious material extending between said beams below their lower flanges and having bars molded in them at their sides,V said bars projecting upwardly above the upper faces of the slabs and having horizontally disposed flanges ati-their upper edges the lower portions of the gsides of the slabs projecting outwardly beyond said bars to form troughs between the sides of adjacent slabs, and clips having vertical legs provided with slots telescopically engaging the flanges of said bars and having horizontal legs engaging the upper faces of the lower flanges of the beams for attaching the slabs to the beams. f

In testimony whereof, I sign my name.

HERBERT E. MARKS 

